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SC431

Adjustable Shunt Regulator

Semtech Corporation 

SC431

POWER MANAGEMENT

Absolute Maximum Ratings

Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters

specified in the Electrical Characteristics section is not implied.

Parameter

Symbol

Maximum

Units

Cathode Voltage

Continous Cathode Current

Reference Input Current

Power Dissipation

SOT-23-3

at

TA

=

25°C

SO-8

VZ

31

V

IZ

150

mA

IREF

10

mA

PD

0.37

W

0.78

Thermal Resistance

SOT-23-3

SO-8

θJA

336

°C/W

163

Operating Ambient Temperature Range

SC431Cx-.5, SC431Cx-1, SC431Cx-2

SC431CxQ

TA

-40 to +85

°C

-40 to +125

Operating Junction Temperature Range

Storage Temperature Range

Lead Temperature (Soldering) 10 seconds

ESD Rating (Human Body Model)

TJ

-40 to +150

°C

TSTG

-65 to +150

°C

TLEAD

300

°C

VESD

2

kV

Electrical Characteristics

Unless specified:TA = 25°C. Values in bold apply over full operating ambient temperature range.

SC431Cx-.5,

SC431CxQ

SC431Cx-1

Parameter

Symbol

Condition

Min Typ Max Min Typ Max Units

Reference Voltage

VREF Temp Deviation

Ratio of Change in

VREF to Change in VZ

Reference Input

Current

DIREeFvTiaetmiopnerature

Off-State Cathode

Current

Dynamic Output

Impedance

Minimum Operating

Current

VREF

VDEV

∆VREF

∆VZ

IREF

IREF(DEV)

IZ (OFF)

rZ

IZ (MIN)

VZ = VREF, IZ = 10mA(1)

VZ = VREF, IZ = 10mA(1)

IZ = 10mA, ∆VZ = 10V to VREF

IZ = 10mA, ∆VZ =30V to 10V

R1 = 10kΩ, R2 = ∞,

IZ = 10mA(2)

R1 = 10kΩ, R2 = ∞,

IZ =10mA(2)

VREF = 0V, VZ =30V(3)

2.482

2.495

8

-0.5

-1.0

0.5

0.4

0.04

2.507

17

-2.7

-2.0

4

1.2

0.50

2.470

2.495

8

-0.5

-1.0

0.5

0.4

0.04

2.520

25

-2.7

-2.0

4

1.2

0.50

V

mV

mV/V

µA

µA

µA

IZ

f < 1kHz,

= 130µA

tVoZ1=00VmREAF (1)

VZ

=

V (1)

REF

0.25 0.50

130

0.25 0.50 Ω

130 µA

 2008 Semtech Corp.

2

www.semtech.com

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